Tracking Impressions of HTML animated ads

Hi,

I have created html animated ads using adobe animate for a client. They are working with a 3rd party to upload them.
We've inserted the click-tag into the code and that is working fine (i.e number of clicks are being counted).

To track impressions of the creative do we need to add further lines of code? Or is this usually done through Google
Ad Manager by the third party who are uploading the ads?

Use Campaign Manager to track impressions and clicks on HTML emails - Campaign Manager Help​

From what I can see on this link, it is something that can be done by the person uploading the ads.

If anyone can help i'd be very grateful!

Thanks,

Scott